The prussian blue tracing of the bar you are working on is an important and precise help when building the knife of beads,punctures, etc.
Using indelible markers is a widely used solution but if you use this method you know that just a little water or WD-40 and you immediately lose the tracing, a nice hassle while you are working on your blade.
On the market there are many prussian blue products already made to track is usually composed of: methilated spirit, shellac, gentian violet but if you want you can try this recipe that allows you with a few euros to have a huge amount of liquid to track can be an alternative for you.
Prussian blue marking is a dye used in metalworking to help mark parts for further processing.
It is sometimes called Dykem (as a son-in-law nicknamed after a popular brand).
It is used to stain or paint a metal object with a very thin layer of dye that can be scratched using a tracing tip or other sharp tool to reveal a bright, yet very narrow line in the metal below.
The advantages are that any existing scratches are covered with tincture, and the new lines have a contrasting background.
Blue marking is obtained by mixing denatured alcohol with shellac and gentian violet.
This should not be confused with the blue of the non-drying engineer’s blue, produced by mixing Prussian blue with oil or grease.
Despite this, it is sometimes called the engineer’s blue, which can create confusion.
Personally for convenience I use the spray versions but out of curiosity I tried this recipe that is still useful if you want to save a few euros because you can produce large quantities that you can also give to some of your friend maker or hobbyist.
For example there is this version that you can find online even if the shipping cost affects the final price.
The blue layout provides a smooth, quick-drying coating for tool and mold manufacturers and production layout jobs.
It adheres to all types of metal.
It is not corrosive, non-flaking and heat resistant.
You can use it to track your knife.
Also although it may seem strange it is not easy to find this type of product and often the cost of the product is considerable.
Ps. I do not know if there is a deterioration of the product over time, my advice is once used to keep it well sealed and in the dark.
The preparation process is simple and the product can be used immediately once mixed.
A small premise is necessary because the ink you make must have fundamental properties:
- Must dry quickly
- It should not be affected by the lubricant (including wd40) and water when dimming the bar to cool it
- The colored surface does not have to “get out” at the passage of the tip to be drawn (fine) to obtain sharp and precise lines.
- You have to resist passing your fingers on the piece.
- He has to easily take off at the end of the job with a rag soaked in alcohol.
attention!! If there is something wrong with you it means that you have done something wrong in the ingredients or doses indicated.
- Melt 50 grams of shellac in 250 cc of Alcohol at 94 or 99°,beware that the shellac to melt needs time so close the jar shake it well and leave to rest throughout the night. In the morning you will find all the rubber loose. It uses 99.9° denatured ethyl alcohol (used in restoration as a solvent for shellac) and shellac de cerata in scales (pure in flakes, bleached and purified from dyeing substances);
- Use an old nylon stocking to filter the liquid into another jar.
- Pour slowly of the blue-colored alcohol (powders that dissolve in alcohol create a solution of the chosen color), waving well with a stick to avoid lumps, color 10 grams for 250 cc of alcohol. The powder color is a “bite color for purple alcohol wood“, you can find it in stores that deal with supplies for restorations (price about 2 euros). It must be toalcohol, do not replace it with colors to aniline or water.
- Get yourself a plastic jar with an airtight closure in which to beam and good tracking.
Ps. It is important to store it in an airtight container to avoid evaporation of alcohol and close it immediately after use.
To spread it use a cotton bud (the ear hygiene stick) so that it is spread without leaving the lines due to the hairs of the brush and also because it is disposable and you do not have to clean the brush every time.
Spread it quickly and prevent it from thick.
Pss. Aniline is a very toxic product for humans to handle it carefully or use something alternative but always alcohol-based.
The color you want you can vary from blue to red, it’s up to you!
The recipe and procedure to make you prussia blue in different quantities:
Ingredients per 200cc of product:
- 40 grams of rubber flakes (possibly decanted)
- 200 cc of ethyl alcohol at 94 degrees (better at 99.9 degrees)
- 8 grams powdered (alcohol-soluble aniline)
Ingredients for 250cc of product:
- 50 grams of rubber flakes (possibly decanted)
- 250 cc of 94-degree ethyl alcohol (better at 99.9 degrees)
- 10 grams of powdered colour (alcohol-soluble aniline)
Ps. attention!! 200 cubic centimeters is 20 centilitres
Good tracking with DIY prussia blue!
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